On Jun 26, 2008, at 4:15 AM, Graham Cox wrote:
I think this is your problem. After the first rect is marked as needing update, the needsDisplay method will return YES. That then rejects all subsequent rect marking until the next event loop and the view has been redrawn. Then another rect gets a shot, and so on. Simply removing that if([![self needsDisplay]) should fix your problem, I think.
For whatever reason, simply calling -setNeedsDisplay:YES without update rectangle and needsDisplay check is producing the same kind of lag. The view is not updated any faster or more accurately. Granted, the needsDisplay check may be wrong though, I can see the issue there.
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